National Geographic travel photographer of the year 2017 winners – in pictures - Al Ain, city in the desert Nature, second prize A gaggle of swans take flight. Photograph: Hiromi Kano/National Geographic Travel Photographer of the Year

Las Cuevas de Mármol (The Marble Caves) sit in the middle of General Carrera Lake, which lies between Chile and Argentina. The tunnels and caves are only reachable by boat. The swooping arches have been formed by more than years of water lapping agai

tiles provide distinctive cladding for the exterior. Photo by Architecture by Whitney Sander of Sander Architects Story: An Energy-Efficient Hybrid Prefab Keeps Cool in the Palm Springs Desert To continue the story, head to the link in our bio.